a teenager had been begging his mom for an iphone all year without much success. so he was pleasantly surprised to find one all wrapped up on christmas day. that is until he found the very personal, very detailed contract that came with it, not from the phone company, no, this one was written by his mom. >> number one, it is my phone, i bought it, i pay for it. no porn. i will always know the password. >> reporter: it's not exactly the christmas list you'd expect as a 13-year-old. >> hand the phone in to one of your parents at approximately 7:30 p.m. >> reporter: an 18-point contract littered with dos and don'ts. >> don't take a zillion pictures and videos. >> reporter: greg hoffman's ticket to a new iphone. >> oh, my god. my first reaction was why, why did she really have to do this? >> what i wanted to do and show him, how you could be a responsible user of technology without abusing it without becoming addicted. >> reporter: janelle hoffman's message has struck a chord with parents worried about the increasing use of smartphones. more than 50 million iphones ar